Why is the shell can considered to be biotic? a. because it is found in the biosphereb. because it was alivec. because it came from something livingd. because it is not living

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

sex cells are usually half's then they find another half and make a fertilize egg